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arXiv 1707.09628math.PR
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临界时IPDSAW标度极限的形状定理

A shape theorem for the scaling limit of the IPDSAW at criticality

Philippe Carmona, Nicolas Pétrélis

摘要:

本文给出了Zwanzig和Lauritzen(1968)提出的临界相互作用部分定向自回避行走(IPDSAW)的标度极限的完整刻画。由于系统大小$L$发散,我们证明了一组占用的网站,重新缩放水平由$L^{2/3}$和垂直由$L^{1/3}$收敛于法律的Hausdorff距离向一个非平凡的随机集。这个极限集是用布朗运动$B$建立的,该布朗运动的条件是在其几何面积达到$1$的时刻回到$a_1$的原点。$B$到$a_1$的模给出了极限集的高度,而其质心过程是一个独立的布朗运动。获得形状定理需要推导出一个泛函中心极限定理的行程的随机游动拉普拉斯对称增量条件下扫描一个指定的几何区域。这一结果在一篇配套论文arXiv:1709.06448中得到了证明。

英文摘要:

In this paper we give a complete characterization of the scaling limit of the critical Interacting Partially Directed Self-Avoiding Walk (IPDSAW) introduced in Zwanzig and Lauritzen (1968). As the system size $L$ diverges, we prove that the set of occupied sites, rescaled horizontally by $L^{2/3}$ and vertically by $L^{1/3}$ converges in law for the Hausdorff distance towards a non trivial random set. This limiting set is built with a Brownian motion $B$ conditioned to come back at the origin at $a_1$ the time at which its geometric area reaches $1$. The modulus of $B$ up to $a_1$ gives the height of the limiting set, while its center of mass process is an independent Brownian motion. Obtaining the shape theorem requires to derive a functional central limit theorem for the excursion of a random walk with Laplace symmetric increments conditioned on sweeping a prescribed geometric area. This result is proven in a companion paper arXiv:1709.06448.

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